diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 38d5956..baea55a 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -2915,6 +2915,8 @@
 			type->tp_as_sequence = base->tp_as_sequence;
 		if (type->tp_as_mapping == NULL)
 			type->tp_as_mapping = base->tp_as_mapping;
+		if (type->tp_as_buffer == NULL)
+			type->tp_as_buffer = base->tp_as_buffer;
 	}
 
 	/* Link into each base class's list of subclasses */